A. NET and Web technology based network teaching platform is proposed in this paper, aiming at realizing the network teaching environment for teachers and students' communication and interaction. Based on the requirement analysis in English course network teaching, this paper determines three-layered framework system in system B/S mode, clarifies basic functions in system realization, adopts software engineering method, and sets up software model of some systems for database design. Furthermore, this paper designs some teaching links such as teaching, learning, homework, examination, course interpretation, etc. The system test analysis shows that our scheme solves high technical content, long time, human and material resources consumption in developing networked curriculum and provides a general support platform for implementation of network teaching.